Stator

Abstract

A stator (10) comprises: a stator core (24) having an annular section (26) and a plurality of tooth sections (22) radially extending from the annular section radially inward of the annular section; an insulator (16) attached to the stator core; and a plurality of wire winding parts (18) wound around the plurality of tooth sections with the insulator interposed therebetween. The insulator has: a first insulating section (30) that extends in the tangential direction of the stator core and insulates the annular section from the wire winding part side; and a second insulating section (32) that extends in the radial direction of the stator core and insulates the tooth sections from the wire winding part side. The first insulating section and the second insulating section are connected to each other via a corner section (34). A winding (18A) of the wire winding parts which is disposed inside the corner section is in contact with the first insulating section and the second insulating section. A gas layer (50) is formed between said winding and a corner surface (34A) that is the inner surface of the corner section.

Description

Stator CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on and claims the benefit of priority from Japanese Patent Application No. 2024-032883, filed on March 5, 2024, the entire contents of which are incorporated herein by reference.

[0002] The technology of the present disclosure relates to a stator.

[0003] A known stator includes a stator core having a plurality of radially extending teeth, an insulator attached to the stator core, and a plurality of windings wound around the plurality of teeth via the insulator. Some stators of this type have insulators attached to the axial end faces of the teeth and insulating paper provided on the side faces of the teeth (see, for example, JP 2018-198515 A).

[0004] As a result of detailed investigations by the inventors, the following problem was discovered: In the stator configured as described above, there is a concern that dielectric breakdown may occur in the insulating paper when a high voltage is applied to the winding portion. To address this issue, it is conceivable to use an insulator that is thicker than the insulating paper instead of the insulating paper, but doing so may result in a decrease in the space factor of the winding portion.

[0005] The technique of the present disclosure provides a stator that can ensure insulation for the winding winding portion without reducing the space factor of the winding winding portion.

[0006] A stator according to the disclosed technology comprises a stator core having an annular portion and a plurality of tooth portions extending radially inward from the annular portion, an insulator attached to the stator core, and a plurality of winding winding portions wound around the plurality of tooth portions via the insulator, wherein the insulator has a first insulating portion extending tangentially to the stator core and insulating the annular portion from the winding winding portion side, and a second insulating portion extending radially to the stator core and insulating the tooth portions from the winding winding portion side, the first insulating portion and the second insulating portion being connected via a corner portion, and a winding of the winding winding portion arranged inside the corner portion is in contact with the first insulating portion and the second insulating portion, and a gas layer is formed between the corner surface, which is the inner surface of the corner portion, and the winding.

[0007] According to the technique of the present disclosure, a stator is provided that can ensure insulation for the winding winding portion without reducing the space factor of the winding winding portion.

[0008] FIG. 1 is a plan view of a stator according to a first embodiment of the technique of the present disclosure. FIG. 2 is a plan cross-sectional view of a stator component according to the first embodiment. FIG. 3 is a plan cross-sectional view of an enlarged main portion (portion A) of the stator component according to the first embodiment. FIG. 4 is a perspective view of a stator component excluding a winding winding portion. FIG. 5 is a plan cross-sectional view of an enlarged main portion (portion B) of the stator component according to the first embodiment. FIG. 6 is a plan cross-sectional view of a stator component according to a second embodiment. FIG. 7 is a plan cross-sectional view of an enlarged main portion of the stator component according to the second embodiment. FIG. 8 is a plan cross-sectional view of an enlarged main portion of the stator component according to a third embodiment. FIG. 9 is a plan cross-sectional view of an enlarged main portion of a stator component according to a first modified example of the third embodiment. FIG. 10 is a plan cross-sectional view of an enlarged main portion of a stator component according to a second modified example of the third embodiment. FIG. 11 is a plan cross-sectional view of an enlarged main portion of a stator component according to a third modified example of the third embodiment. FIG. 12 is a plan cross-sectional view of an enlarged main portion of a stator component according to a fourth modified example of the third embodiment. FIG. 13 is a plan cross-sectional view of an enlarged main portion of a stator component according to a fourth modified example of the third embodiment. FIG. 14 is a plan cross-sectional view of an enlarged main portion of a stator component according to a fourth modified example of the fourth embodiment. FIG. 15 is a plan cross-sectional view of an enlarged main portion of a stator component according to a first modified example of the fourth embodiment. FIG. 16 is a plan cross-sectional view of an enlarged main portion of a stator component according to a second modified example of the fourth embodiment Fig. 10 is an enlarged plan sectional view of a main part of a stator component according to a third modified example of the fourth embodiment; Fig. 11 is an enlarged plan sectional view of a main part of a stator component according to a fourth modified example of the fourth embodiment; Fig. 12 is an enlarged plan sectional view of a main part of a stator component according to a first comparative example; Fig. 13 is an enlarged plan sectional view of a main part of a stator component according to a second comparative example.

[0009] First Embodiment First, a first embodiment of the technology of the present disclosure will be described.

[0010] As shown in FIG. 1 , a stator 10 according to this embodiment includes a plurality of stator components 12. The stator 10 is configured by combining a plurality of stator components 12 in an annular shape. FIG. 1 shows the configuration of half of the stator 10. The stator 10 is applied to a brushless motor. Brushless motors may be used for any purpose. Examples of brushless motors include fan motors, pump drive motors, and compressor motors.

[0011] In each figure, the X direction indicates the tangential direction of the stator 10, the Y direction indicates the radial direction of the stator 10, and the Z direction indicates the axial direction of the stator 10. In the following description, the circumferential direction of the stator 10 refers to the direction around the central axis of the stator 10. The tangential direction, radial direction, axial direction, and circumferential direction of the stator core 24, which will be described later, are the same directions as the tangential direction, radial direction, axial direction, and circumferential direction of the stator 10, respectively.

[0012] As shown in Fig. 2, each stator component 12 includes a core member 14, an insulator 16, and a winding winding portion 18. The core member 14 is formed in a T-shape when viewed from the Z direction, and has a core back portion 20 and teeth portions 22. The core back portion 20 extends in the circumferential direction of the stator core 24 (see Fig. 1), and the teeth portions 22 extend from the center of the core back portion 20 inward in the Y direction. The tip portions of the teeth portions 22 are free ends, and the base ends of the teeth portions 22 are connected to the core back portion 20.

[0013] A stator core 24 (see FIG. 1) is formed by combining a plurality of core members 14 in an annular shape. When the stator core 24 is formed, the plurality of core back portions 20 form an annular portion 26 (see FIG. 1) that is the outer periphery of the stator core 24, and the plurality of teeth portions 22 extend radially from the center of the stator core 24. Slots 28 are formed between the plurality of teeth portions 22.

[0014] Note that the configuration of each stator component 12, including its details, is not strictly symmetrical in the X direction when viewed from the Z direction. However, for the sake of convenience, the following description will assume that the main configuration of each stator component 12 is symmetrical in the X direction when viewed from the Z direction, and will explain the configuration of one side of each stator component 12.

[0015] 3, a mounting surface 20A is formed on the core back portion 20, and a mounting surface 22A is formed on the tooth portion 22. The mounting surface 20A extends in the X direction and the Z direction and faces inward in the Y direction. The mounting surface 22A extends in the Y direction and the Z direction and faces one side in the X direction. The mounting surface 20A and the mounting surface 22A are in contact with the slot 28.

[0016] The insulator 16 is attached to the core member 14. The insulator 16 is made of resin. Examples of resins that can be used to form the insulator 16 include polyimide, polyamide, polyphenylene sulfide (PPS), and polybutylene terephthalate (PBT). The resin that can be used to form the insulator 16 may be any resin.

[0017] The insulator 16 has an inner wall portion 30 and a side wall portion 32. The inner wall portion 30 is an example of a "first insulating portion" according to the technology of the present disclosure. The side wall portion 32 is an example of a "second insulating portion" according to the technology of the present disclosure. The inner wall portion 30 is attached to the mounting surface 20A and covers the mounting surface 20A. The side wall portion 32 is attached to the mounting surface 22A and covers the mounting surface 22A. The inner wall portion 30 and the side wall portion 32 are arranged in the slot 28.

[0018] The winding portion 18 is wound around the teeth 22 via the insulators 16. The winding portion 18 is formed by winding a wire around the teeth 22 in the Y direction. A single wire forming the winding portion 18 may be wound around only one tooth 22 to form only one winding portion 18, or may be wound around multiple teeth 22 to form several winding portions 18.

[0019] The first winding of the winding portion 18, which is located on the side wall portion 32 side, is aligned in the Y direction, which is the extension direction of the teeth 22. Similarly, the second and subsequent windings are also aligned in the Y direction, which is the extension direction of the teeth 22.

[0020] The inner wall portion 30 insulates the core back portion 20 from the winding portion 18, and the side wall portion 32 insulates the teeth portion 22 from the winding portion 18. The inner wall portion 30 and the side wall portion 32 are connected via a corner portion 34 formed in an L-shape when viewed from the Z direction.

[0021] The inner wall portion 30 has a mounted surface 30A facing the mounting surface 20A, and the side wall portion 32 has a mounted surface 32A facing the mounting surface 22A. The mounted surface 30A is the surface of the inner wall portion 30 that is mounted to the core back portion 20, and the mounted surface 32A is the surface of the side wall portion 32 that is mounted to the tooth portion 22. The mounted surface 30A is an example of a "first mounted surface" according to the technology of the present disclosure, and the mounted surface 32A is an example of a "second mounted surface" according to the technology of the present disclosure.

[0022] A first groove 36 is formed in the mounting surface 30A of the inner wall portion 30, and a second groove 38 is formed in the mounting surface 32A of the side wall portion 32. The first groove 36 opens to the core back portion 20 side, and the second groove 38 opens to the teeth portion 22 side. As an example, one first groove 36 is formed in the mounting surface 30A of the inner wall portion 30, and two second grooves 38 are formed in the mounting surface 32A of the side wall portion 32. The two second grooves 38 are aligned in the Y direction.

[0023] A first gas layer 40 is formed by the first groove 36 between the core back portion 20 and the winding winding portion 18 in the Y direction, and a second gas layer 42 is formed by the second groove 38 between the tooth portion 22 and the winding winding portion 18 in the X direction. In other words, the first gas layer 40 is formed inside the first groove 36, and the second gas layer 42 is formed inside the second groove 38. The first groove 36 and the second groove 38 are formed to penetrate in the Z direction.

[0024] The inner wall portion 30 has an abutment portion 44. The abutment portion 44 is formed adjacent to the first groove 36 and abuts against the mounting surface 20A. Similarly, the side wall portion 32 has an abutment portion 46. The abutment portion 46 is formed adjacent to the second groove 38 and abuts against the mounting surface 22A.

[0025] More specifically, the abutment portion 44 formed on the inner wall portion 30 has a first abutment portion 44A formed at one end of the inner wall portion 30 in the X direction, which is the width direction of the tooth portion 22, and a second abutment portion 44B formed at the other end of the inner wall portion 30 in the X direction.

[0026] More specifically, the abutment portion 46 formed on the side wall portion 32 has a first abutment portion 46A formed at one end of the side wall portion 32 in the Y direction, which is the extension direction of the tooth portion 22, a second abutment portion 46B formed at the other end of the side wall portion 32 in the Y direction, and a third abutment portion 46C formed in the center of the side wall portion 32 in the Y direction.

[0027] 4, the insulator 16 is composed of a first insulator 16A and a second insulator 16B that are divided in the Z direction. A dividing portion 48 that divides the first insulator 16A and the second insulator 16B in the Z direction is located, for example, in the center of the tooth portion 22 in the Z direction. The first insulator 16A and the second insulator 16B are connected at the dividing portion 48.

[0028] As described above, when the insulator 16 is divided into the first insulator 16A and the second insulator 16B, a creepage distance D (see FIG. 5 , described later) is generated between the winding winding portion 18 and the core member 14 along the division 48. If the creepage distance D is short, there is a risk that the insulation for the winding winding portion 18 may not be ensured. In order to ensure the creepage distance D, it is conceivable to increase the thickness of the insulator 16, but doing so would reduce the space factor of the winding winding portion 18. Therefore, it is desirable to ensure the creepage distance D without increasing the thickness of the insulator 16. Below, a structure incorporating an ingenious feature for ensuring the creepage distance D will be described.

[0029] As shown in FIG. 5 , among the multiple windings of the first turn, the winding 18A (see also FIG. 3 ) located on the inner wall 30 side is disposed inside the corner 34. This winding 18A is in contact with the inner wall 30 and the side wall 32. A corner surface 34A, which is the inner surface of the corner 34, is formed by a curved surface. The radius of the corner surface 34A is set to be smaller than the radius of the winding 18A. As a result, a gas layer 50 is formed between the corner surface 34A and the winding 18A. That is, a gap for forming the gas layer 50 is provided between the corner surface 34A and the winding 18A. More specifically, the gas layer 50 is formed between the outer peripheral surface of the winding 18A and the corner surface 34A in the range from the point of contact between the winding 18A and the inner wall 30 to the point of contact between the winding 18A and the side wall 32.

[0030] The gap between the corner surface 34A and the winding 18A to form the gas layer 50 is set to a dimension larger than the gap formed by the maximum error between the maximum value of the allowable range of the radius of the corner surface 34A and the minimum value of the allowable range of the radius of the winding 18A (i.e., the gap caused by the maximum error from the design value) when the radius of the corner surface 34A is set to the same reference value as the radius of the winding 18A. The tolerance of the radius of the winding 18A is specified in JIS C3102. The tolerance of the corner surface 34A is set to, for example, ±0.1 mm.

[0031] Next, the effects of the first embodiment will be described.

[0032] First, a comparative example will be described to clarify the effects of the first embodiment. As shown in Fig. 18 , when the radius of the corner surface 34A is set to the same dimension as the radius of the winding 18A, no gap is formed between the corner surface 34A and the winding 18A, and the winding 18A is in close contact with the corner surface 34A. In this case, the starting point D1 on the winding winding portion 18 side of the creepage distance D (i.e., the shortest distance) defined along the dividing portion 48 between the winding winding portion 18 and the core member 14 is set within the range of the corner surface 34A. If the creepage distance D is insufficient, it may be possible to thicken the insulator 16. However, as described above, doing so would reduce the space factor of the winding winding portion 18.

[0033] In contrast, as shown in Figure 5, in the first embodiment, the radius of the corner surface 34A is set to be smaller than the radius of the winding 18A, thereby forming a gas layer 50 between the corner surface 34A and the winding 18A. Therefore, the starting point D1 on the winding winding portion 18 side of the creepage distance D defined along the dividing portion 48 between the winding winding portion 18 and the core member 14 is set outside the range of the corner surface 34A. Therefore, the creepage distance D can be made longer than in the comparative example, and the creepage distance D can be ensured without increasing the thickness of the insulator 16. This ensures insulation from the winding winding portion 18 without reducing the space factor of the winding winding portion 18.

[0034] Furthermore, the structure is simple, requiring only that the radius of the corner surface 34A be smaller than the radius of the winding 18A, and therefore costs can be kept from increasing.

[0035] Furthermore, by forming the first gas layer 40 between the core back portion 20 and the winding portion 18 by the first groove 36, the thickness of the inner wall portion 30 can be made thinner than when the core back portion 20 and the winding portion 18 are insulated only by the inner wall portion 30. Similarly, by forming the second gas layer 42 between the tooth portion 22 and the winding portion 18 by the second groove 38, the thickness of the side wall portion 32 can be made thinner than when the tooth portion 22 and the winding portion 18 are insulated only by the side wall portion 32. This allows the cross-sectional area of ​​the slot 28 to be increased, which in turn allows the number of turns of the winding portion 18 to be increased, thereby preventing the stator 10 from becoming larger. In other words, it is possible to prevent the stator 10 from becoming larger in size in order to increase the cross-sectional area of ​​the slot 28.

[0036] The inner wall portion 30 has a first abutment portion 44A formed at one end of the inner wall portion 30 and a second abutment portion 44B formed at the other end of the inner wall portion 30, and the first abutment portion 44A and the second abutment portion 44B abut against the mounting surface 20A of the core back portion 20. As a result, the inner wall portion 30 is supported at one end and the other end by the mounting surface 20A of the core back portion 20, so that rattle of the insulator 16 relative to the stator core 24 can be suppressed.

[0037] Similarly, the side wall portion 32 has a first abutment portion 46A formed at one end of the side wall portion 32 and a second abutment portion 46B formed at the other end of the side wall portion 32, and the first abutment portion 46A and the second abutment portion 46B abut against the mounting surfaces 22A of the teeth portions 22. As a result, the side wall portion 32 is supported at one end and the other end by the mounting surfaces 22A of the teeth portions 22, thereby suppressing rattling of the insulator 16 relative to the stator core 24.

[0038] Furthermore, the side wall 32 has a third abutment 46C formed in the center of the side wall 32, and the third abutment 46C abuts against the mounting surface 22A of the tooth 22. As a result, the side wall 32 is supported at its center by the mounting surface 22A of the tooth 22, so that even when the second groove 38 is formed in the side wall 32, the side wall 32 can be prevented from bending toward the mounting surface 22A due to the fastening force of the winding winding 18.

[0039] Furthermore, the second grooves 38 are open to the tooth 22 side, not to the winding portion 18 side. Therefore, the winding portion 18 can be supported on the plane of the side wall 32 on the winding portion 18 side, and deformation of the winding portion 18 toward the tooth 22 side can be suppressed.

[0040] Second Embodiment Next, a second embodiment of the technique of the present disclosure will be described.

[0041] In the second embodiment, the configuration of the core member 14 is modified as follows compared to the first embodiment. That is, as shown in FIG. 6 , a first groove 136 is formed in the mounting surface 20A of the core back portion 20, and a second groove 138 is formed in the mounting surface 22A of the tooth portion 22. The mounting surface 20A is the surface of the core back portion 20 on which the inner wall portion 30 is mounted, and the mounting surface 22A is the surface of the tooth portion 22 on which the side wall portion 32 is mounted. The mounting surface 20A is an example of a "first mounting surface" according to the technology of the present disclosure, and the mounting surface 22A is an example of a "second mounting surface" according to the technology of the present disclosure. The first groove 136 opens to the inner wall portion 30 side, and the second groove 138 opens to the side wall portion 32 side.

[0042] A first gas layer 140 is formed by the first groove 136 between the core back portion 20 and the winding winding portion 18 in the Y direction, and a second gas layer 142 is formed by the second groove 138 between the teeth portion 22 and the winding winding portion 18 in the X direction. In other words, the first gas layer 140 is formed inside the first groove 136, and the second gas layer 142 is formed inside the second groove 138. The first groove 136 and the second groove 138 are formed to penetrate in the Z direction.

[0043] 7 , the radius of corner surface 34A is set to be smaller than the radius of winding 18A, thereby forming a gas layer 50 between corner surface 34A and winding 18A, similar to the first embodiment. More specifically, gas layer 50 is formed between the outer circumferential surface of winding 18A and corner surface 34A in the range from the point of contact between winding 18A and inner wall 30 to the point of contact between winding 18A and side wall 32.

[0044] Next, the effects of the second embodiment will be described.

[0045] First, to clarify the effects of the second embodiment, a comparative example will be described. As shown in Fig. 19 , when the radius of the corner surface 34A is set to the same dimension as the radius of the winding 18A, no gap is formed between the corner surface 34A and the winding 18A, and the winding 18A is in close contact with the corner surface 34A. In this case, the starting point D1 on the winding winding portion 18 side of the creepage distance D (i.e., the shortest distance) defined along the dividing portion 48 between the winding winding portion 18 and the core member 14 is set within the range of the corner surface 34A. If the creepage distance D is insufficient, it may be possible to thicken the insulator 16. However, as described above, doing so would reduce the space factor of the winding winding portion 18.

[0046] In contrast, as shown in Figure 7, in the second embodiment, the radius of the corner surface 34A is set to be smaller than the radius of the winding 18A, thereby forming a gas layer 50 between the corner surface 34A and the winding 18A. Therefore, the starting point D1 on the winding winding portion 18 side of the creepage distance D defined along the dividing portion 48 between the winding winding portion 18 and the core member 14 is set outside the range of the corner surface 34A. Therefore, the creepage distance D can be made longer than in the comparative example, and the creepage distance D can be ensured without increasing the thickness of the insulator 16. This ensures insulation from the winding winding portion 18 without reducing the space factor of the winding winding portion 18.

[0047] Furthermore, the structure is simple, requiring only that the radius of the corner surface 34A be smaller than the radius of the winding 18A, and therefore costs can be kept from increasing.

[0048] Furthermore, by forming a first gas layer 140 between the core back portion 20 and the winding portion 18 by the first groove 136, the thickness of the inner wall portion 30 can be made thinner than when the core back portion 20 and the winding portion 18 are insulated only by the inner wall portion 30. Similarly, by forming a second gas layer 142 between the tooth portion 22 and the winding portion 18 by the second groove 138, the thickness of the side wall portion 32 can be made thinner than when the tooth portion 22 and the winding portion 18 are insulated only by the side wall portion 32. This allows the cross-sectional area of ​​the slot 28 to be increased, which in turn allows the number of turns of the winding portion 18 to be increased, thereby preventing the stator 10 from becoming larger. In other words, it is possible to prevent the stator 10 from becoming larger in size in order to increase the cross-sectional area of ​​the slot 28.

[0049] Third Embodiment Next, a third embodiment of the technique of the present disclosure will be described.

[0050] In the third embodiment, the configuration of the insulator 16 is modified as follows compared to the first embodiment. That is, as shown in Fig. 8, a relief groove 60 recessed in the corner surface 34A away from the winding 18A is formed. The relief groove 60 formed in the corner surface 34A forms a gas layer 50 between the corner surface 34A and the winding 18A.

[0051] The relief groove 60 has a first groove side surface 60A that is continuous with a support surface 30B, which is the surface of the inner wall portion 30 that supports the winding portion 18, via one end of the corner surface 34A, and a second groove side surface 60B that is continuous with a support surface 32B, which is the surface of the side wall portion 32 that supports the winding portion 18, via the other end of the corner surface 34A. The support surface 30B is an example of a "first support surface" according to the technology of the present disclosure, and the support surface 32B is an example of a "second support surface" according to the technology of the present disclosure. The first groove side surface 60A and the second groove side surface 60B are both formed by arc-shaped curved surfaces when viewed from the Z direction.

[0052] In this way, when the relief groove 60 is formed between the corner surface 34A and the winding 18A, the volume of the gas layer 50 can be increased by the amount of the relief groove 60. This improves the insulation of the winding winding portion 18.

[0053] 9, the support surface 32B and the second groove side surface 60B may extend linearly along the Y direction. With this configuration, when the insulator 16 is formed by resin molding, the support surface 32B and the second groove side surface 60B can be easily formed.

[0054] 10, the support surface 30B and the first groove side surface 60A may extend linearly along the X direction. With this configuration, when the insulator 16 is formed by resin molding, the support surface 30B and the first groove side surface 60A can be easily formed.

[0055] In addition, the first groove side surface 60A may be formed by an inclined surface that is inclined with respect to the X direction when viewed from the Z direction (see Figure 9), or it may be formed by an arc-shaped curved surface when viewed from the Z direction, as shown in Figure 11.

[0056] In addition, the second groove side surface 60B may be formed by an inclined surface that is inclined with respect to the Y direction when viewed from the Z direction (see Figure 10), or it may be formed by an arc-shaped curved surface when viewed from the Z direction, as shown in Figure 12.

[0057] Fourth Embodiment Next, a fourth embodiment of the technique of the present disclosure will be described.

[0058] In the fourth embodiment, the configuration of the insulator 16 is changed as follows compared to the second embodiment. That is, as shown in Fig. 13, a relief groove 60 recessed in the corner surface 34A away from the winding 18A is formed. The relief groove 60 formed in the corner surface 34A forms a gas layer 50 between the corner surface 34A and the winding 18A.

[0059] The relief groove 60 has a first groove side surface 60A that is continuous with a support surface 30B, which is the surface of the inner wall portion 30 that supports the winding portion 18, via one end of the corner surface 34A, and a second groove side surface 60B that is continuous with a support surface 32B, which is the surface of the side wall portion 32 that supports the winding portion 18, via the other end of the corner surface 34A. The first groove side surface 60A and the second groove side surface 60B are both formed by arc-shaped curved surfaces when viewed from the Z direction.

[0060] In this way, when the relief groove 60 is formed between the corner surface 34A and the winding 18A, the volume of the gas layer 50 can be increased by the amount of the relief groove 60. This improves the insulation of the winding winding portion 18.

[0061] 14, the support surface 32B and the second groove side surface 60B may extend linearly along the Y direction. With this configuration, when the insulator 16 is formed by resin molding, the support surface 32B and the second groove side surface 60B can be easily formed.

[0062] 15, the support surface 30B and the first groove side surface 60A may extend linearly along the X direction. With this configuration, when the insulator 16 is formed by resin molding, the support surface 30B and the first groove side surface 60A can be easily formed.

[0063] In addition, the first groove side surface 60A may be formed by an inclined surface that is inclined with respect to the X direction when viewed from the Z direction (see Figure 14), or it may be formed by an arc-shaped curved surface when viewed from the Z direction, as shown in Figure 16.

[0064] In addition, the second groove side surface 60B may be formed by an inclined surface that is inclined with respect to the Y direction when viewed from the Z direction (see Figure 15), or it may be formed by an arc-shaped curved surface when viewed from the Z direction, as shown in Figure 17.

[0065] Furthermore, among the above-described multiple embodiments (including modified examples), embodiments that can be combined may be combined as appropriate.

[0066] The above describes one embodiment of the present disclosure, but the present disclosure is not limited to the above, and it goes without saying that various modifications can be made to the present disclosure without departing from the spirit of the present disclosure.

[0067] The following are supplementary notes regarding the technology of the present disclosure. (Supplementary Note 1) A stator core (24) having an annular portion (26) and a plurality of teeth (22) extending radially inward from the annular portion, an insulator (16) attached to the stator core, and a plurality of winding winding portions (18) wound around the plurality of teeth via the insulator, wherein the insulator has: a first insulating portion (30) extending in a tangential direction of the stator core and insulating the annular portion from the winding winding portion side, and a second insulating portion (32) extending in a radial direction of the stator core and insulating the teeth from the winding winding portion side, wherein the first insulating portion and the second insulating portion are connected via a corner portion (34), and a winding (18A) of the winding winding portion arranged inside the corner portion is in contact with the first insulating portion and the second insulating portion, A stator (10) in which a gas layer (50) is formed between the winding and a corner surface (34A) that is an inner surface of the corner portion. (Supplementary Note 2) The stator according to Supplementary Note 1, in which the corner surface is formed by a curved surface, and the gas layer is formed between the corner surface and the winding by setting the radius of the corner surface to a dimension smaller than the radius of the winding. (Supplementary Note 3) The stator according to Supplementary Note 1 or Supplementary Note 2, in which the corner surface has a relief groove (60) that is recessed toward a side that escapes from the winding, and the gas layer is formed between the corner surface and the winding by forming the relief groove in the corner surface. (Supplementary Note 4) The stator according to Supplementary Note 3, wherein the relief groove has a first groove side surface (60A) that is continuous with a first support surface (30B) that is a surface of the first insulating part that supports the winding winding part, and a second groove side surface (60B) that is continuous with a second support surface (32B) that is a surface of the second insulating part that supports the winding winding part, and the first support surface and the first groove side surface extend along a tangential direction of the stator core.(Supplementary Note 5) The stator according to Supplementary Note 3, wherein the relief groove has a first groove side surface that is continuous with a first support surface, which is a surface of the first insulating portion that supports the winding winding portion, and a second groove side surface that is continuous with a second support surface, which is a surface of the second insulating portion that supports the winding winding portion, and the second support surface and the second groove side surface extend along a radial direction of the stator core. (Appendix 6) The stator according to any one of appendices 1 to 5, wherein a first groove (36) opening to the annular portion is formed on a first mounting surface (30A) of the first insulating portion, which is the surface that is mounted to the annular portion; a second groove (38) opening to the tooth portion is formed on a second mounting surface (32A) of the second insulating portion, which is the surface that is mounted to the tooth portion; and a first gas layer (40) formed by the first groove and a second gas layer (42) formed by the second groove between the stator core and the winding winding portion. (Appendix 7) The stator according to any one of appendixes 1 to 5, wherein a first groove (136) opening to the first insulating portion is formed in a first mounting surface (20A) of the annular portion, which is the surface on which the first insulating portion is mounted, and a second groove (138) opening to the second insulating portion is formed in a second mounting surface (22A) of the tooth portion, which is the surface on which the second insulating portion is mounted, and a first gas layer (140) is formed by the first groove and a second gas layer (142) is formed by the second groove between the stator core and the winding winding portion.

Claims

1. A stator core (24) having an annular portion (26) and a plurality of teeth (22) extending radially inward from the annular portion; an insulator (16) attached to the stator core; and a plurality of winding winding portions (18) wound around the plurality of teeth via the insulator, wherein the insulator has: a first insulating portion (30) extending in a tangential direction of the stator core and insulating the annular portion from the winding winding portion side; and a second insulating portion (32) extending in a radial direction of the stator core and insulating the teeth from the winding winding portion side, wherein the first insulating portion and the second insulating portion are connected via a corner portion (34), and a winding (18A) of the winding winding portion arranged inside the corner portion is in contact with the first insulating portion and the second insulating portion, A gas layer (50) is formed between the winding and a corner surface (34A) that is an inner surface of the corner portion.

2. A stator according to claim 1, wherein the corner surface is formed by a curved surface, and the radius of the corner surface is set to a dimension smaller than the radius of the winding, thereby forming the gas layer between the corner surface and the winding.

3. A stator according to claim 1 or claim 2, wherein the corner surface is formed with a relief groove (60) recessed in a direction away from the winding, and the gas layer is formed between the corner surface and the winding by the relief groove being formed in the corner surface.

4. A stator as described in claim 3, wherein the relief groove has a first groove side surface (60A) continuous with a first support surface (30B), which is the surface of the first insulating part that supports the winding winding part, and a second groove side surface (60B) continuous with a second support surface (32B), which is the surface of the second insulating part that supports the winding winding part, and the first support surface and the first groove side surface extend along a tangential direction of the stator core.

5. A stator as described in claim 3, wherein the relief groove has a first groove side surface that is continuous with a first support surface, which is the surface of the first insulating part that supports the winding winding part, and a second groove side surface that is continuous with a second support surface, which is the surface of the second insulating part that supports the winding winding part, and the second support surface and the second groove side surface extend radially of the stator core.

6. A stator as set forth in any one of claims 1 to 5, wherein a first groove (36) opening onto the annular portion is formed on a first mounting surface (30A) of the first insulating part, which is the surface that is mounted onto the annular portion; and a second groove (38) opening onto the tooth portion is formed on a second mounting surface (32A) of the second insulating part, which is the surface that is mounted onto the tooth portion; and a first gas layer (40) is formed by the first groove and a second gas layer (42) is formed by the second groove between the stator core and the winding winding portion.

7. A stator as set forth in any one of claims 1 to 5, wherein a first groove (136) opening toward the first insulating portion is formed on a first mounting surface (20A) of the annular portion, which is the surface on which the first insulating portion is mounted, and a second groove (138) opening toward the second insulating portion is formed on a second mounting surface (22A) of the teeth, which is the surface on which the second insulating portion is mounted, and a first gas layer (140) is formed by the first groove and a second gas layer (142) is formed by the second groove between the stator core and the winding winding portion.

Images